The most likely answer is "Rovio thinks there is more money to be made making Angry Birds merchandise and an Angry Birds movie than releasing Angry Birds on Nintendo platforms, so that's what they're doing." There's nothing wrong with that, I guess.

I just hate Angry Birds! Everyone around my age seem to play it on their phone. I don't know how it became so popular here in Finland although it's made here (or how it seems to be known by people outside Finland). I'm keeping away from those who play it and enjoy playing my 3DS while they don't know that there are far better games I downloaded Angry Birds on my Chrome but I've played it only 3 times before I could say that it is too boring to continue.

“On my business card, I am a corporate president. In my mind, I am a game developer. But in my heart, I am a gamer”

I just hate Angry Birds! Everyone around my age seem to play it on their phone. I don't know how it became so popular here in Finland although it's made here (or how it seems to be known by people outside Finland). I'm keeping away from those who play it and enjoy playing my 3DS while they don't know that there are far better games I downloaded Angry Birds on my Chrome but I've played it only 3 times before I could say that it is too boring to continue.

Yeah, I didn't really enjoy it either. It was good in Study Hall, being the only game I could access and stuff, but now I don't need it.

Angry Birds is fun when you try to get a high score on every level (3 stars). It can get very difficult on the later levels where you have to hit the pigs at a precise spot so they all get killed in the least amount of tries.